void IteratorChecker::checkDeadSymbols(SymbolReaper &SR,
CheckerContext &C) const {
// Cleanup
auto State = C.getState();
auto RegionMap = State->get<IteratorRegionMap>();
for (const auto Reg : RegionMap) {
if (!SR.isLiveRegion(Reg.first)) {
State = State->remove<IteratorRegionMap>(Reg.first);
}
}
auto SymbolMap = State->get<IteratorSymbolMap>();
for (const auto Sym : SymbolMap) {
if (!SR.isLive(Sym.first)) {
State = State->remove<IteratorSymbolMap>(Sym.first);
}
}
auto ContMap = State->get<ContainerMap>();
for (const auto Cont : ContMap) {
if (!SR.isLiveRegion(Cont.first)) {
State = State->remove<ContainerMap>(Cont.first);
}
}
auto ComparisonMap = State->get<IteratorComparisonMap>();
for (const auto Comp : ComparisonMap) {
if (!SR.isLive(Comp.first)) {
State = State->remove<IteratorComparisonMap>(Comp.first);
}
}
}
Environment
EnvironmentManager::RemoveDeadBindings(Environment Env, const Stmt *S,
SymbolReaper &SymReaper,
const GRState *ST,
llvm::SmallVectorImpl<const MemRegion*> &DRoots) {
CFG &C = *Env.getAnalysisContext().getCFG();
// We construct a new Environment object entirely, as this is cheaper than
// individually removing all the subexpression bindings (which will greatly
// outnumber block-level expression bindings).
Environment NewEnv = getInitialEnvironment(&Env.getAnalysisContext());
// Iterate over the block-expr bindings.
for (Environment::iterator I = Env.begin(), E = Env.end();
I != E; ++I) {
const Stmt *BlkExpr = I.getKey();
// Not a block-level expression?
if (!C.isBlkExpr(BlkExpr))
continue;
const SVal &X = I.getData();
if (SymReaper.isLive(S, BlkExpr)) {
// Copy the binding to the new map.
NewEnv.ExprBindings = F.Add(NewEnv.ExprBindings, BlkExpr, X);
// If the block expr's value is a memory region, then mark that region.
if (isa<loc::MemRegionVal>(X)) {
const MemRegion* R = cast<loc::MemRegionVal>(X).getRegion();
DRoots.push_back(R);
// Mark the super region of the RX as live.
// e.g.: int x; char *y = (char*) &x; if (*y) ...
// 'y' => element region. 'x' is its super region.
// We only add one level super region for now.
// FIXME: maybe multiple level of super regions should be added.
if (const SubRegion *SR = dyn_cast<SubRegion>(R))
DRoots.push_back(SR->getSuperRegion());
}
// Mark all symbols in the block expr's value live.
MarkLiveCallback cb(SymReaper);
ST->scanReachableSymbols(X, cb);
continue;
}
// Otherwise the expression is dead with a couple exceptions.
// Do not misclean LogicalExpr or ConditionalOperator. It is dead at the
// beginning of itself, but we need its UndefinedVal to determine its
// SVal.
if (X.isUndef() && cast<UndefinedVal>(X).getData())
NewEnv.ExprBindings = F.Add(NewEnv.ExprBindings, BlkExpr, X);
}
return NewEnv;
}
static bool IsLiveRegion(SymbolReaper &Reaper, const MemRegion *MR) {
MR = MR->getBaseRegion();
if (const SymbolicRegion *SR = dyn_cast<SymbolicRegion>(MR))
return Reaper.isLive(SR->getSymbol());
if (const VarRegion *VR = dyn_cast<VarRegion>(MR))
return Reaper.isLive(VR);
// FIXME: This is a gross over-approximation. What we really need is a way to
// tell if anything still refers to this region. Unlike SymbolicRegions,
// AllocaRegions don't have associated symbols, though, so we don't actually
// have a way to track their liveness.
if (isa<AllocaRegion>(MR))
return true;
if (isa<CXXThisRegion>(MR))
return true;
if (isa<MemSpaceRegion>(MR))
return true;
return false;
}
// removeDeadBindings:
// - Remove subexpression bindings.
// - Remove dead block expression bindings.
// - Keep live block expression bindings:
// - Mark their reachable symbols live in SymbolReaper,
// see ScanReachableSymbols.
// - Mark the region in DRoots if the binding is a loc::MemRegionVal.
Environment
EnvironmentManager::removeDeadBindings(Environment Env,
SymbolReaper &SymReaper,
ProgramStateRef ST) {
// We construct a new Environment object entirely, as this is cheaper than
// individually removing all the subexpression bindings (which will greatly
// outnumber block-level expression bindings).
Environment NewEnv = getInitialEnvironment();
MarkLiveCallback CB(SymReaper);
ScanReachableSymbols RSScaner(ST, CB);
llvm::ImmutableMapRef<EnvironmentEntry,SVal>
EBMapRef(NewEnv.ExprBindings.getRootWithoutRetain(),
F.getTreeFactory());
// Iterate over the block-expr bindings.
for (Environment::iterator I = Env.begin(), E = Env.end();
I != E; ++I) {
const EnvironmentEntry &BlkExpr = I.getKey();
const SVal &X = I.getData();
if (SymReaper.isLive(BlkExpr.getStmt(), BlkExpr.getLocationContext())) {
// Copy the binding to the new map.
EBMapRef = EBMapRef.add(BlkExpr, X);
// If the block expr's value is a memory region, then mark that region.
if (Optional<loc::MemRegionVal> R = X.getAs<loc::MemRegionVal>())
SymReaper.markLive(R->getRegion());
// Mark all symbols in the block expr's value live.
RSScaner.scan(X);
continue;
} else {
SymExpr::symbol_iterator SI = X.symbol_begin(), SE = X.symbol_end();
for (; SI != SE; ++SI)
SymReaper.maybeDead(*SI);
}
}
NewEnv.ExprBindings = EBMapRef.asImmutableMap();
return NewEnv;
}
void MacOSKeychainAPIChecker::checkDeadSymbols(SymbolReaper &SR,
CheckerContext &C) const {
ProgramStateRef State = C.getState();
AllocatedDataTy ASet = State->get<AllocatedData>();
if (ASet.isEmpty())
return;
bool Changed = false;
AllocationPairVec Errors;
for (AllocatedDataTy::iterator I = ASet.begin(), E = ASet.end(); I != E; ++I) {
if (SR.isLive(I->first))
continue;
Changed = true;
State = State->remove<AllocatedData>(I->first);
// If the allocated symbol is null or if the allocation call might have
// returned an error, do not report.
ConstraintManager &CMgr = State->getConstraintManager();
ConditionTruthVal AllocFailed = CMgr.isNull(State, I.getKey());
if (AllocFailed.isConstrainedTrue() ||
definitelyReturnedError(I->second.Region, State, C.getSValBuilder()))
continue;
Errors.push_back(std::make_pair(I->first, &I->second));
}
if (!Changed) {
// Generate the new, cleaned up state.
C.addTransition(State);
return;
}
static SimpleProgramPointTag Tag("MacOSKeychainAPIChecker : DeadSymbolsLeak");
ExplodedNode *N = C.addTransition(C.getState(), C.getPredecessor(), &Tag);
// Generate the error reports.
for (AllocationPairVec::iterator I = Errors.begin(), E = Errors.end();
I != E; ++I) {
C.emitReport(generateAllocatedDataNotReleasedReport(*I, N, C));
}
// Generate the new, cleaned up state.
C.addTransition(State, N);
}
void MacOSKeychainAPIChecker::checkDeadSymbols(SymbolReaper &SR,
CheckerContext &C) const {
const ProgramState *State = C.getState();
AllocatedSetTy ASet = State->get<AllocatedData>();
if (ASet.isEmpty())
return;
bool Changed = false;
AllocationPairVec Errors;
for (AllocatedSetTy::iterator I = ASet.begin(), E = ASet.end(); I != E; ++I) {
if (SR.isLive(I->first))
continue;
Changed = true;
State = State->remove<AllocatedData>(I->first);
// If the allocated symbol is null or if the allocation call might have
// returned an error, do not report.
if (State->getSymVal(I->first) ||
definitelyReturnedError(I->second.Region, State, C.getSValBuilder()))
continue;
Errors.push_back(std::make_pair(I->first, &I->second));
}
if (!Changed)
return;
// Generate the new, cleaned up state.
ExplodedNode *N = C.addTransition(State);
if (!N)
return;
// Generate the error reports.
for (AllocationPairVec::iterator I = Errors.begin(), E = Errors.end();
I != E; ++I) {
C.EmitReport(generateAllocatedDataNotReleasedReport(*I, N));
}
}
void InnerPointerChecker::checkDeadSymbols(SymbolReaper &SymReaper,
CheckerContext &C) const {
ProgramStateRef State = C.getState();
PtrSet::Factory &F = State->getStateManager().get_context<PtrSet>();
RawPtrMapTy RPM = State->get<RawPtrMap>();
for (const auto Entry : RPM) {
if (!SymReaper.isLiveRegion(Entry.first)) {
// Due to incomplete destructor support, some dead regions might
// remain in the program state map. Clean them up.
State = State->remove<RawPtrMap>(Entry.first);
}
if (const PtrSet *OldSet = State->get<RawPtrMap>(Entry.first)) {
PtrSet CleanedUpSet = *OldSet;
for (const auto Symbol : Entry.second) {
if (!SymReaper.isLive(Symbol))
CleanedUpSet = F.remove(CleanedUpSet, Symbol);
}
State = CleanedUpSet.isEmpty()
? State->remove<RawPtrMap>(Entry.first)
: State->set<RawPtrMap>(Entry.first, CleanedUpSet);
}
}
C.addTransition(State);
}
// removeDeadBindings:
// - Remove subexpression bindings.
// - Remove dead block expression bindings.
// - Keep live block expression bindings:
// - Mark their reachable symbols live in SymbolReaper,
// see ScanReachableSymbols.
// - Mark the region in DRoots if the binding is a loc::MemRegionVal.
Environment
EnvironmentManager::removeDeadBindings(Environment Env,
SymbolReaper &SymReaper,
const ProgramState *ST) {
// We construct a new Environment object entirely, as this is cheaper than
// individually removing all the subexpression bindings (which will greatly
// outnumber block-level expression bindings).
Environment NewEnv = getInitialEnvironment();
SmallVector<std::pair<EnvironmentEntry, SVal>, 10> deferredLocations;
MarkLiveCallback CB(SymReaper);
ScanReachableSymbols RSScaner(ST, CB);
llvm::ImmutableMapRef<EnvironmentEntry,SVal>
EBMapRef(NewEnv.ExprBindings.getRootWithoutRetain(),
F.getTreeFactory());
// Iterate over the block-expr bindings.
for (Environment::iterator I = Env.begin(), E = Env.end();
I != E; ++I) {
const EnvironmentEntry &BlkExpr = I.getKey();
// For recorded locations (used when evaluating loads and stores), we
// consider them live only when their associated normal expression is
// also live.
// NOTE: This assumes that loads/stores that evaluated to UnknownVal
// still have an entry in the map.
if (IsLocation(BlkExpr)) {
deferredLocations.push_back(std::make_pair(BlkExpr, I.getData()));
continue;
}
const SVal &X = I.getData();
if (SymReaper.isLive(BlkExpr.getStmt(), BlkExpr.getLocationContext())) {
// Copy the binding to the new map.
EBMapRef = EBMapRef.add(BlkExpr, X);
// If the block expr's value is a memory region, then mark that region.
if (isa<loc::MemRegionVal>(X)) {
const MemRegion *R = cast<loc::MemRegionVal>(X).getRegion();
SymReaper.markLive(R);
}
// Mark all symbols in the block expr's value live.
RSScaner.scan(X);
continue;
}
// Otherwise the expression is dead with a couple exceptions.
// Do not misclean LogicalExpr or ConditionalOperator. It is dead at the
// beginning of itself, but we need its UndefinedVal to determine its
// SVal.
if (X.isUndef() && cast<UndefinedVal>(X).getData())
EBMapRef = EBMapRef.add(BlkExpr, X);
}
// Go through he deferred locations and add them to the new environment if
// the correspond Stmt* is in the map as well.
for (SmallVectorImpl<std::pair<EnvironmentEntry, SVal> >::iterator
I = deferredLocations.begin(), E = deferredLocations.end(); I != E; ++I) {
const EnvironmentEntry &En = I->first;
const Stmt *S = (Stmt*) (((uintptr_t) En.getStmt()) & (uintptr_t) ~0x1);
if (EBMapRef.lookup(EnvironmentEntry(S, En.getLocationContext())))
EBMapRef = EBMapRef.add(En, I->second);
}
NewEnv.ExprBindings = EBMapRef.asImmutableMap();
return NewEnv;
}
Store BasicStoreManager::RemoveDeadBindings(Store store, Stmt* Loc,
SymbolReaper& SymReaper,
llvm::SmallVectorImpl<const MemRegion*>& RegionRoots)
{
BindingsTy B = GetBindings(store);
typedef SVal::symbol_iterator symbol_iterator;
// Iterate over the variable bindings.
for (BindingsTy::iterator I=B.begin(), E=B.end(); I!=E ; ++I) {
if (const VarRegion *VR = dyn_cast<VarRegion>(I.getKey())) {
if (SymReaper.isLive(Loc, VR))
RegionRoots.push_back(VR);
else
continue;
}
else if (isa<ObjCIvarRegion>(I.getKey())) {
RegionRoots.push_back(I.getKey());
}
else
continue;
// Mark the bindings in the data as live.
SVal X = I.getData();
for (symbol_iterator SI=X.symbol_begin(), SE=X.symbol_end(); SI!=SE; ++SI)
SymReaper.markLive(*SI);
}
// Scan for live variables and live symbols.
llvm::SmallPtrSet<const MemRegion*, 10> Marked;
while (!RegionRoots.empty()) {
const MemRegion* MR = RegionRoots.back();
RegionRoots.pop_back();
while (MR) {
if (const SymbolicRegion* SymR = dyn_cast<SymbolicRegion>(MR)) {
SymReaper.markLive(SymR->getSymbol());
break;
}
else if (isa<VarRegion>(MR) || isa<ObjCIvarRegion>(MR)) {
if (Marked.count(MR))
break;
Marked.insert(MR);
SVal X = Retrieve(store, loc::MemRegionVal(MR));
// FIXME: We need to handle symbols nested in region definitions.
for (symbol_iterator SI=X.symbol_begin(),SE=X.symbol_end(); SI!=SE; ++SI)
SymReaper.markLive(*SI);
if (!isa<loc::MemRegionVal>(X))
break;
const loc::MemRegionVal& LVD = cast<loc::MemRegionVal>(X);
RegionRoots.push_back(LVD.getRegion());
break;
}
else if (const SubRegion* R = dyn_cast<SubRegion>(MR))
MR = R->getSuperRegion();
else
break;
}
}
// Remove dead variable bindings.
for (BindingsTy::iterator I=B.begin(), E=B.end(); I!=E ; ++I) {
const MemRegion* R = I.getKey();
if (!Marked.count(R)) {
store = Remove(store, ValMgr.makeLoc(R));
SVal X = I.getData();
for (symbol_iterator SI=X.symbol_begin(), SE=X.symbol_end(); SI!=SE; ++SI)
SymReaper.maybeDead(*SI);
}
}
return store;
}
Environment
EnvironmentManager::RemoveDeadBindings(Environment Env,
SymbolReaper &SymReaper,
const GRState *ST,
llvm::SmallVectorImpl<const MemRegion*> &DRoots) {
CFG &C = *SymReaper.getLocationContext()->getCFG();
// We construct a new Environment object entirely, as this is cheaper than
// individually removing all the subexpression bindings (which will greatly
// outnumber block-level expression bindings).
Environment NewEnv = getInitialEnvironment();
// Iterate over the block-expr bindings.
for (Environment::iterator I = Env.begin(), E = Env.end();
I != E; ++I) {
const Stmt *BlkExpr = I.getKey();
const SVal &X = I.getData();
// Block-level expressions in callers are assumed always live.
if (isBlockExprInCallers(BlkExpr, SymReaper.getLocationContext())) {
NewEnv.ExprBindings = F.Add(NewEnv.ExprBindings, BlkExpr, X);
if (isa<loc::MemRegionVal>(X)) {
const MemRegion* R = cast<loc::MemRegionVal>(X).getRegion();
DRoots.push_back(R);
}
// Mark all symbols in the block expr's value live.
MarkLiveCallback cb(SymReaper);
ST->scanReachableSymbols(X, cb);
continue;
}
// Not a block-level expression?
if (!C.isBlkExpr(BlkExpr))
continue;
if (SymReaper.isLive(BlkExpr)) {
// Copy the binding to the new map.
NewEnv.ExprBindings = F.Add(NewEnv.ExprBindings, BlkExpr, X);
// If the block expr's value is a memory region, then mark that region.
if (isa<loc::MemRegionVal>(X)) {
const MemRegion* R = cast<loc::MemRegionVal>(X).getRegion();
DRoots.push_back(R);
}
// Mark all symbols in the block expr's value live.
MarkLiveCallback cb(SymReaper);
ST->scanReachableSymbols(X, cb);
continue;
}
// Otherwise the expression is dead with a couple exceptions.
// Do not misclean LogicalExpr or ConditionalOperator. It is dead at the
// beginning of itself, but we need its UndefinedVal to determine its
// SVal.
if (X.isUndef() && cast<UndefinedVal>(X).getData())
NewEnv.ExprBindings = F.Add(NewEnv.ExprBindings, BlkExpr, X);
}
return NewEnv;
}
// removeDeadBindings:
// - Remove subexpression bindings.
// - Remove dead block expression bindings.
// - Keep live block expression bindings:
// - Mark their reachable symbols live in SymbolReaper,
// see ScanReachableSymbols.
// - Mark the region in DRoots if the binding is a loc::MemRegionVal.
Environment
EnvironmentManager::removeDeadBindings(Environment Env,
SymbolReaper &SymReaper,
const GRState *ST,
llvm::SmallVectorImpl<const MemRegion*> &DRoots) {
CFG &C = *SymReaper.getLocationContext()->getCFG();
// We construct a new Environment object entirely, as this is cheaper than
// individually removing all the subexpression bindings (which will greatly
// outnumber block-level expression bindings).
Environment NewEnv = getInitialEnvironment();
llvm::SmallVector<std::pair<const Stmt*, SVal>, 10> deferredLocations;
// Iterate over the block-expr bindings.
for (Environment::iterator I = Env.begin(), E = Env.end();
I != E; ++I) {
const Stmt *BlkExpr = I.getKey();
// For recorded locations (used when evaluating loads and stores), we
// consider them live only when their associated normal expression is
// also live.
// NOTE: This assumes that loads/stores that evaluated to UnknownVal
// still have an entry in the map.
if (IsLocation(BlkExpr)) {
deferredLocations.push_back(std::make_pair(BlkExpr, I.getData()));
continue;
}
const SVal &X = I.getData();
// Block-level expressions in callers are assumed always live.
if (isBlockExprInCallers(BlkExpr, SymReaper.getLocationContext())) {
NewEnv.ExprBindings = F.add(NewEnv.ExprBindings, BlkExpr, X);
if (isa<loc::MemRegionVal>(X)) {
const MemRegion* R = cast<loc::MemRegionVal>(X).getRegion();
DRoots.push_back(R);
}
// Mark all symbols in the block expr's value live.
MarkLiveCallback cb(SymReaper);
ST->scanReachableSymbols(X, cb);
continue;
}
// Not a block-level expression?
if (!C.isBlkExpr(BlkExpr))
continue;
if (SymReaper.isLive(BlkExpr)) {
// Copy the binding to the new map.
NewEnv.ExprBindings = F.add(NewEnv.ExprBindings, BlkExpr, X);
// If the block expr's value is a memory region, then mark that region.
if (isa<loc::MemRegionVal>(X)) {
const MemRegion* R = cast<loc::MemRegionVal>(X).getRegion();
DRoots.push_back(R);
}
// Mark all symbols in the block expr's value live.
MarkLiveCallback cb(SymReaper);
ST->scanReachableSymbols(X, cb);
continue;
}
// Otherwise the expression is dead with a couple exceptions.
// Do not misclean LogicalExpr or ConditionalOperator. It is dead at the
// beginning of itself, but we need its UndefinedVal to determine its
// SVal.
if (X.isUndef() && cast<UndefinedVal>(X).getData())
NewEnv.ExprBindings = F.add(NewEnv.ExprBindings, BlkExpr, X);
}
// Go through he deferred locations and add them to the new environment if
// the correspond Stmt* is in the map as well.
for (llvm::SmallVectorImpl<std::pair<const Stmt*, SVal> >::iterator
I = deferredLocations.begin(), E = deferredLocations.end(); I != E; ++I) {
const Stmt *S = (Stmt*) (((uintptr_t) I->first) & (uintptr_t) ~0x1);
if (NewEnv.ExprBindings.lookup(S))
NewEnv.ExprBindings = F.add(NewEnv.ExprBindings, I->first, I->second);
}
return NewEnv;
}
